The IPv4 was first developed in the 1970s, and the RFC 791 (IPv4) functionality was published in 1981. Because of the rapid expansion of the internet, IPv4 address space has been getting consumed over the years after 1981.
Internet Engineering Task Force (IETF) started working on a new protocol from 1994, which is going to replace IPv4.
Following are the major RFCs related with IPv6, which will replace IPv4 in near future.
• Internet Protocol, Version 6 (IPv6) Specification (RFC 2460) was published in December 1998.
• Basic Socket Interface Extensions for IPv6 (RFC 2553) was published in March 1999.
• Dynamic Host Configuration Protocol for IPv6 (DHCPv6) (RFC 3315) was published in July 2003.
• Mobility Support in IPv6 (RFC 3775) was published in June 2004.
• IPv6 Flow Label Specification (RFC 3697) was published in March 2004.
• IP Version 6 Addressing Architecture (RFC 4291) was published in February 2006.
• IPv6 Node Requirements (RFC 4294) was published in April 2006.
Limitations of IPv4
Introduction to IPv6 Addressing
IPv6 Address formats
Types of IPv6 Addresses
Differences Between IPv4 and IPv6
IPv6 Datagram Header Format